91Ó°ÊÓ

The specific heat of methane gas is \(2.20 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C}\). If the temperature of a sample of methane gas rises by \(15^{\circ} \mathrm{C}\) when \(8.8 \mathrm{~kJ}\) of heat energy is added to the sample, what is the mass of the sample?

Convert: (a) \(23.0{ }^{\circ} \mathrm{C}\) to \(\mathrm{K}\) (b) \(98.6^{\circ} \mathrm{F}\) to \({ }^{\circ} \mathrm{C}\) (c) \(296 \mathrm{~K}\) to \({ }^{\circ} \mathrm{F}\) (d) \(32^{\circ} \mathrm{F}\) to \(\mathrm{K}\) (e) \(523 \mathrm{~K}\) to \({ }^{\circ} \mathrm{C}\) (f) \(38^{\circ} \mathrm{C}\) to \({ }^{\circ} \mathrm{F}\)

A block of metal measuring \(3.0 \mathrm{~cm} \times 4.0 \mathrm{~cm} \times 5.0 \mathrm{~cm}\) has a mass of \(470.0\) g. What is the density of the metal in grams per cubic centimeter?

A student measures the mass of an object three times and reports the numeric average of her measurements. If her three measurements are \(212 \mathrm{~g}\), \(260 \mathrm{~g}\), and \(233 \mathrm{~g}\) and the actual mass is \(235 \mathrm{~g}\), which of the following statements is true: (a) The student is accurate but not precise. (b) The student is precise but not accurate. (c) The student is both accurate and precise. (d) It is impossible to tell whether the student is accurate and \(/\) or precise without knowing how she determined the mass.

The density of an irregularly shaped object is determined by immersing the object in water. If the mass of the object is \(8.34 \mathrm{~g}\) and the water level rises from \(25.00 \mathrm{~mL}\) to \(28.10 \mathrm{~mL}\), what is the density of the object in grams per milliliter?

The specific heat of copper is \(0.385 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C}\). How much heat energy in kilojoules is required to raise the temperature of \(454 \mathrm{~g}\) of copper from \(40.0{ }^{\circ} \mathrm{C}\) to \(75.0^{\circ} \mathrm{C} ?\)

If a graduated cylinder has markings that indicate \(0.01 \mathrm{~mL}\), what is the uncertainty in any volumes determined using this graduated cylinder?

The density of gold is \(19.3 \mathrm{~g} / \mathrm{mL}\), that of lead is \(11.4 \mathrm{~g} / \mathrm{mL}\), that of iron \(7.8 \mathrm{~g} / \mathrm{mL}\), and that of aluminum \(2.7 \mathrm{~g} / \mathrm{mL}\). A student is given separate samples of three substances \(\mathrm{A}, \mathrm{B}\), and \(\mathrm{C}\), along with a graduated cylinder containing \(50.0 \mathrm{~mL}\) of water. Each sample has a mass of \(200.0 \mathrm{~g}\), and the student finds that the volumes of the samples are A, \(25.64 \mathrm{~mL} ; \mathrm{B}, 10.36 \mathrm{~mL} ;\) and \(\mathrm{C}, 17.54 \mathrm{~mL}\). What is the identity of each substance?

Explain the relationship between a calorie and a Calorie.

A block measures \(6.0 \mathrm{~cm}\) on each side. What is the volume of the block in cubic meters?